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Individual pyrrole molecules readily join together into larger molecul

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Individual pyrrole molecules readily join together into larger molecul  [#permalink]

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New post 21 Jan 2019, 05:18
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53% (02:35) correct 47% (02:35) wrong based on 167 sessions

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Individual pyrrole molecules readily join together into larger molecules called polypyrroles. If polypyrroles form from pyrrole in the presence of zeolites, they do so by attaching to the zeolite either in lumps on the outer surface of the zeolite or in delicate chains within the zeolite's inner channels. When zeolite changes color from yellow to black, it means that on or in that zeolite polypyrroles have formed from pyrrole. Yellow zeolite free of any pyrrole was submerged in dissolved pyrrole. The zeolite, turned black even though no polypyrroles formed on its outer surface.

If the statements above are true, which one of the following must on the basis of them be true?


(A) Polypyrroles had already formed on or in the zeolite before it was submerged.

(B) Lumps of polypyrrole attached to the zeolite were responsible for its color change.

(C) At least some of the pyrrole in which the zeolite was submerged formed polypyrrole chains.

(D) None of the pyrrole in which the zeolite was submerged attached itself to the zeolite.

(E) Little, if any, of the pyrrole in which the zeolite was submerged reached the zeolite's inner channels.

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Re: Individual pyrrole molecules readily join together into larger molecul  [#permalink]

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New post 28 Jan 2019, 10:32
Bunuel wrote:
Individual pyrrole molecules readily join together into larger molecules called polypyrroles. If polypyrroles form from pyrrole in the presence of zeolites, they do so by attaching to the zeolite either in lumps on the outer surface of the zeolite or in delicate chains within the zeolite's inner channels. When zeolite changes color from yellow to black, it means that on or in that zeolite polypyrroles have formed from pyrrole. Yellow zeolite free of any pyrrole was submerged in dissolved pyrrole. The zeolite, turned black even though no polypyrroles formed on its outer surface.

If the statements above are true, which one of the following must on the basis of them be true?


(A) Polypyrroles had already formed on or in the zeolite before it was submerged.

(B) Lumps of polypyrrole attached to the zeolite were responsible for its color change.

(C) At least some of the pyrrole in which the zeolite was submerged formed polypyrrole chains.

(D) None of the pyrrole in which the zeolite was submerged attached itself to the zeolite.

(E) Little, if any, of the pyrrole in which the zeolite was submerged reached the zeolite's inner channels.


My reasoning if it helps anyone:

The passage states that pyrrole molecules attach themselves on/in a zeolites to form a new compound called polypyrroles. A zeolite that has changed colors, means that there is some polypyrroles attached to it (either inside or outside). If a zeolite turns black, but there is no polypyrroles on the outside, it means it must have formed delicate chains within the zeolite's inner channels.

A) If this was true the zeolite would be black. Incorrect

B) The passage says no polypyrroles formed on the outside.

C) Correct, this MUST be true because there are only two ways for a zeolite to turn black. If it was not because of lumps of polypyrroles on the outside, it must be because of polypyrroles chains.

D) We know the zeolite turned black so this cannot be true

E) We know that the pyrrole must have reached the inner channels. That's the only way the zeolite turned black.
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Re: Individual pyrrole molecules readily join together into larger molecul   [#permalink] 28 Jan 2019, 10:32
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